[nocus]

Amerdunbar....I have no direct experience to disagree with you on the glue front ..though many epoxies and plastics etc (and glues presumably therefore too) do leach various chemicals and organic compounds and even at room temperature....our bodies are loaded with all sorts of nasty's from drinking out of various types of plastics for years for example....and so what I'm hoping to obtain through this thread is a definitive list of materials that people know for sure are no problem whatsoever and in this regard perhaps others will write in and confirm your findings further or suggest certain glues (brands and model #'s that are good). I also liked you idea of drilling holes in the tank to affix the tubing and had thought of other similar approaches as well, though I would ideally like to make a rigid structure that sinks and holds the tubing and its holes in the same position every time i put it into the tank i.e., I'm not sure (unless mounting holes were to be drilled and sealed quite far down the tank wall) that under your suggested approach the tubing wouldn't roam around and cause some troubles. I have thought of doing as you say but running the tubing down the tank wall behind one of the large electrodes (emerging at the bottom) in order to hold the tubing loop in place.